在和两个学生交谈后，我才发现，拥有强烈的动机是实现目标的最重要原因之一。

Only after talking to two students did I discover that having strong motivation is one of the biggest factors in reaching goals.

youdao

撞车事故的原因被认定是发动机故障。

The cause of the crash was given as engine failure.

《牛津词典》

我们只好把发动机全部拆开以寻找故障原因。

We had to completely disassemble the engine to find the problem.

《牛津词典》